adding a bar chart plotting tool

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@15507 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
small improvements in docs

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@15508 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
adding tests, was: adding a bar chart plotting tool

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@15509 29f149b2-0c63-11e1-8f5c-a347f6a9acd0
patching executable property, was: adding a bar chart plotting tool

git-svn-id: http://svn.code.sf.net/p/sumo/code/trunk/sumo@15510 29f149b2-0c63-11e1-8f5c-a347f6a9acd0